@johnnybigbro22,
johnnybigbro22 wrote:For ski jumping don't you have to have long legs?
I think so, to some extent.
You'll likely get much better advice from an actual coach for Olympic athletes. They will be experienced in pointing people in the right direction. I'm giving the best advice that I can, but I don't know nearly as much as a coach would know.
Anyway, I believe that in Nordic Combined, the best athletes are "in between" what would be the best shape and size for one of the individual disciplines by itself. They are not as aerodynamic as a pure Ski Jumper, but are more aerodynamic than a pure Cross Country Skier.